Raypak 992B manual Ignition Module, High Limit Manual Reset, Flow Switch, Operating Control

Ignition Module

When additional heat is needed, the combustion air blower starts to purge air from the combustion cham- ber for about 15 seconds. On proof-of-air flow, the air-

The optional single-try ignition module will lock out after failing to light one time. To reset it, press and release the small, recessed black push button located inside of the cut-out on the lower right-hand corner of the ignition module case. Turning off the power to the heater WILL NOT reset the ignition module.

High Limit (Manual Reset)

Fig. 32: Ignition Module

proving switch closes and the igniter is energized. To ensure safe operation, the gas valve cannot open until the igniter is verified. The main burner is automatically lit when the device is powered and pre-purged. The heater performs its own safety check and opens the main valve only after the igniter is proven to be capa- ble of ignition.

The standard ignition module will attempt to light three times before locking out. To reset it, turn off power to the heater, wait 30 seconds and re-apply power.

Code	Condition
On	System OK;
	No faults present
Off	Possible control fault;
	Check power
1 Flash	Low air pressure, brief
	flashing normal on start-up
2 Flashes	Flame in combustion
	chamber; No call for heat
3 Flashes	Ignition lockout
4 Flashes	Low igniter current
5 Flashes	Low 24 VAC, check control
	supply voltage
6 Flashes	Internal fault;
	Replace module

Table N: Ignition Module Diagnostic LED Codes

Fig. 33: High Limit (Manual Reset)

The heater is equipped with a manual reset high limit temperature device. Push the reset button and adjust the setting to 40 - 50°F above desired operating tem- perature.

Flow Switch

Fig. 34: Flow Switch

This dual-purpose control, mounted and wired in series with the main gas valve, shuts off heater in case of pump failure or low water flow.

Operating Control

The heater may be equipped with different types of operating controls. Consult the individual control data

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